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A single user, rebuilt PC, different PC, all updates and current drivers. If you have new good information, I would love to hear it. I guess the root of the bug may be in outdated OS (Windows 7) and in an outdated version of Excel (Excel 2013), but sadly I cannot change either of those. Note that things like "rebooting" and "closing Excel and opening Excel" and "unsharing and sharing the file" are not really fixes, and I have tried them, and none is a permanent fix.
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If you have a fix not mentioned, please advise. Yes, my video card is modern and fully patched. does make it go away but this is only temporary. C:\Users\YourUserNameGoesHere\AppData\Roaming\Microsoft\Excel\. This behaviour is not normal, simply not right. All - As of now, it seems to me this is still a bug in Excel 2013 and/or Windows 7.
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